Excellent question Dave.
If I am going to take a part a Swinden type knife and want to put it back together using the Swinden rivets, the process is entirely different.
A- Using a small flat file, carefully file the dome of the rocker pin flat so you can locate the center.
B- Using a spring-loaded punch locate the center of the pin and peen a center mark that is fairly deep.
C- Using a small burr or very small drill bit, drill deeply into the pin so that the hole goes down the shaft of the pin. Keep in mind on a Swinden knife the rocker pin is probably 3/32" in diameter. When I drill down the shaft I normally use a 1/16" drill.
D- Using a larger burr that is approximately the size of the head on the pin, grind down the pin head.
E- This next step is a bit tricky as it requires three hands or more. Open all the blades of the knife & compress the backsprings using a vice or a Camillus type knife vice to compress the spring, the Camillus type knife vice is the easiest way to do this and less likely to damage your knife.
Note -- Camillus type knife vice & usage: viewtopic.php?f=38&t=10069
F- Insert the 1/16” pin punch into the 1/16" hole you have drilled in the pin and drive the pin out of the knife.
G- Grasping the handles and bolsters on one side, turn it counterclockwise until it comes loose, approximately 5° of turn in the counterclockwise direction.
If I'm in a hurry and I am going to replace the handle material on the knife anyway, I use a rotary tool, (such as a Dremel or Foredom), and a burr; to grind the head off the rocker pin. Then I go directly to step E.
The only reason I can think of to keep the Swinden key system intact is if I were going to replace the handle material and reassemble the knife using the Swinden key system. I have done this quite successfully, however if there needs to be any repair work done or blades replaced the Swinden rivets must be cut and the knife converted to pin-through-bolster construction.
I hope this answered your questions,